We hear you are on spree in classic sports car (6)
I believe the answer is:
jaguar
'car' is the definition.
(I have seen 'posh car' mean 'jaguar' so perhaps 'car' could also mean 'jaguar')
'we hear you are on spree in classic sports' is the wordplay.
'we hear' indicates a 'sounds like' (homophone) clue.
'are on' says to put letters next to each other.
'spree' becomes 'jag' (I've seen this in another clue).
'in classic sports' becomes 'ar' (I am not sure about this - if you are sure you should believe this answer much more).
'you' is a homophone of 'u'.
'u' after 'jag' is 'jagu'.
'jagu'+'ar'='JAGUAR'
Can you help me to learn more?
(Other definitions for jaguar that I've seen before include "Large black-spotted cat" , "Large jungle cat" , "Large spotted cat" , "Jet" , "Panther's relative - driven on the road" .)